Proofs Without Words III

Proofs without words (PWW) are figures or diagrams that help the reader see why a particular mathematical statement is true, and how one might begin to formally prove it true. The proofs in the book are by topic into five chapters: Geometry & Algebra; Trigonometry, Calculus & Analytic Geometry; Inequalities; Integers & Integer Sums; and Infinite Series & Other Topics.